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7221 Sallaba (1981 SJ)
Classification: Main-belt Asteroid          SPK-ID: 2007221
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2174256152879165 3.9562e-08  
a 2.410435185180205 1.029e-08 au
q 1.886344831930755 9.3149e-08 au
i 1.267521436906341 3.6703e-06 deg
node 318.0345961108434 0.00021624 deg
peri 22.96033575080272 0.00021649 deg
M 133.1565135807084 1.3279e-05 deg
tp 2458494.906445404811
4.8653e-05 TDB
period 1366.915329635351
n .2633667149640033 1.6864e-09 deg/d
Q 2.934525538429654 1.2527e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1209  
   data-arc span      30469 days (83.42 yr)  
   first obs. used      1936-08-28  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56817  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:24:09  

Additional Information
 Earth MOID = .878016 au 
 Jupiter MOID = 2.46698 au 
 T_jup = 3.487 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.9   n/a MPO448985  
diameter diameter 2.596 km 0.879 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.262   0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7221 Sallaba           Discovered 1981 Sept. 22 by Z. Vavrova at Klet.
Jan Sallaba (1775-1827) was the builder and, from 1821, chief construction manager of the Schwarzenberg court in Cesky Krumlov. He designed and built Joseph's look-out tower at the top of Klet mountain, which opened in 1825, as well as gloriets in Cesky Krumlov and Zlata Koruna. The name was suggested by J. Ticha.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-02-22Last Updated: 2016-02-25

Alternate Designations
 1981 SJ = 1936 QH1 = 1992 OS8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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